Supersensitizing combinations of halogen substituted benzotriazo

Details Supersensitizing combinations of halogen substituted benzotriazo Supersensitizing combinations of halogen substituted benzotriazo

1976-01-14

1977-06-21

Klein, David

Gas separation: apparatus

Electric field separation apparatus

Collecting electrode details

96109, 96126, G03C 114, G03C 119, G03C 134, G03C 140

Patent

active

040309274

ABSTRACT:
A silver halide photographic emulsion supersensitized by a combination of (1) at least one cyanine sensitizing dye containing therein two 5- or 6-membered nitrogen-containing heterocyclic nuclei which may be the same as or different from each other and which are attached, through a conjugated methine chain consisting of three, five or seven methine groups, to each other, and (2) a benzotriazole substituted with at least one halogen atom, both (1) and (2) being present in a supersensitizing amount. The emulsion shows reduced fog and intensified spectral sensitivity than an emulsion containing the cyanine dye alone.

REFERENCES:
patent: 2566167 (1951-08-01), Carroll et al.
patent: 3457078 (1969-07-01), Riester
patent: 3592656 (1971-07-01), Brooks
patent: 3622316 (1971-11-01), Bird et al.
patent: 3671255 (1972-06-01), Haga et al.

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